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Inbreeding vs outbreeding depression in a marine species with low dispersal potential
Marine Ecology ( IF 1.1 ) Pub Date : 2021-01-17 , DOI: 10.1111/maec.12635
Camila Montecinos 1 , Carolina Álvarez 1 , Rodrigo Riera 1, 2 , Antonio Brante 1, 3
Affiliation  

Inbreeding depression strongly affects the biological fitness of organisms throughout their life cycle. These negative effects are more pronounced in species with low dispersal potentials, where mating among relatives is more likely. However, in some species, an outbreeding depression could be expressed when local adaptive and genetic beneficial interactions are disrupted when mating occurs between individuals from different localities. The amphipod Orchestoidea tuberculata inhabits the upper level of sandy beaches. This species has direct development and adults are poor swimmers, resulting in low dispersal potential. We herein evaluated potential inbreeding and outbreeding depression responses in O. tuberculata estimated in fecundity, egg size, and mate choice. Artificial families were used with individuals from different sites within a single beach and from distinct beaches. Results showed that the highest fecundity (66.7%) and the largest egg size (50.1 mm3) were recorded in females that mated with males from the same site, rather than males from other sites and beaches. We also observed potential recognition mechanisms that clearly favored inbreeding (81.8% of males chose females from the same site). These results suggest a potential outbreeding depression in O. tuberculata. Additional studies are needed to elucidate underlying adaptive mechanisms favoring inbreeding in this species.

中文翻译:

低散布潜力海洋物种的近亲繁殖与近亲衰退

近交抑制会在整个生命周期中严重影响生物的生物适应性。这些负面影响在具有低散布潜力的物种中更为明显,在这些物种中亲戚之间更容易交配。但是,在某些物种中,当来自不同地方的个体之间发生交配时,如果当地的适应性和遗传有益的相互作用被破坏,就可能表现出近亲衰退。该端足Orchestoidea tuberculata栖息于沙滩上水平。该物种直接发育,成年后游泳能力较差,因此散布潜力低。我们在这里评估了O. tuberculata中潜在的近交和近交抑郁反应估计繁殖力,卵的大小和选择的伴侣。人工家庭与来自单个海滩和不同海滩的不同地点的人一起使用。结果显示,与同一地点的雄性交配的雌性,而不是其他地点和海滩的雄性,记录的最大繁殖力(66.7%)和最大卵大小(50.1 mm 3)。我们还观察到了明显有利于近亲繁殖的潜在识别机制(81.8%的雄性从同一地点选择雌性)。这些结果表明潜在的交衰退O. tuberculata。需要进一步的研究来阐明有利于该物种近交的潜在适应性机制。
更新日期:2021-02-18
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